Finder gets stuck, and shuts down my wifi connection. Anyone has experienced this same problem?

While working on my website, I have Safari and Finder opened.
Happened three times today. Finder, while moving (by dragging) a file from one window to another, gets stuck.
At the same time, the wifi connection shuts down, and only after I force restart for finder, I get the wifi to work again.
That's quite weird... is't it?
I have two USB 3.0 HD connected, and 3 Firewire ones connected to the thunderbolt inlet.
Can you help me understand the problem? it happens just randomly.
Thanks!

Try a restart.
Do a backup, using either Time Machine or a cloning program, to ensure files/data can be recovered. Two backups are better than one.
Try setting up another admin user account to see if the same problem continues. If Back-to-My Mac is selected in System Preferences, the Guest account will not work. The intent is to see if it is specific to one account or a system wide problem. This account can be deleted later.
Isolating an issue by using another user account
Try booting into the Safe Mode using your normal account.  Disconnect all peripherals except those needed for the test. Shut down the computer and then power it back up after waiting 10 seconds. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear and again when you log in. The boot up is significantly slower than normal. This will reset some caches, forces a directory check, and disables all startup and login items, among other things. When you reboot normally, the initial reboot may be slower than normal. If the system operates normally, there may be 3rd party applications which are causing a problem. Try deleting/disabling the third party applications after a restart by using the application un-installer. For each disable/delete, you will need to restart if you don’t do them all at once.
Safe Mode - Mavericks   also Yosemite
Safe Mode - About

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